The control of recovery process with clove tree (Eugenia caryophyllata) in rainbow trout (Oncorhynchus mykiss)

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Abstract

In order to investigate the effect of different temperature of anesthetic (clove tree) and
recover (anesthetic-free water) solutions on recovery process, The anesthetic induction times
and recovery times of 540 fingerlings of rainbow trout (Oncorhynchus mykiss) weighing 3.2
± 0.2 g in anesthesia/ recovery solutions with cross-combined of temperature of 5,11 and 17
°C as experimental treatments (9 treatments) were compared. The anesthesia was induced
by170 ppm of aqueous clove (Eugenia caryophyllata) solution. Results showed that both
induction and recovery times were adversely temperature-dependent. Recovery times of
treatments, related to temperature of anesthetic solutions and their temperature, were
significantly different (P < 0.05). Our results indicated that mean recovery time (three
temperature treatments) of the fish exposed to the lower temperature anesthetic solutions
generally decreased opposing with higher anesthetic solutions. The lowest recovery time
(61±11.1 seconds) in17°C anesthetic-free water occurred in fishes induced to 5°C anesthetic
solution. In contrast, the highest recovery time (523±154 seconds) in 5°C water happened in
fishes induced to 17°C anesthetic solution. Warm and cold thermal difference in anesthetic
and recover solutions could extend recovery time 1 up to 8 minutes. Regarding to aim and
demanded time, by selected favorite temperatures can control anesthesia/or recovery time in

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Iranian Scientific Fisheries Journal
Volume 23, Issue 1 - Serial Number 86
January and February 2015
Pages 117-122

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